Materials Data on Th4C3 by Materials Project
Th4C3 is MAX Phase-derived structured and crystallizes in the trigonal R-3m space group. The structure is two-dimensional and consists of three Th4C3 sheets oriented in the (0, 0, 1) direction. there are two inequivalent Th sites. In the first Th site, Th is bonded to six C atoms to form a mixture of edge and corner-sharing ThC6 octahedra. The corner-sharing octahedral tilt angles are 0°. There are three shorter (2.64 Å) and three longer (2.79 Å) Th–C bond lengths. In the second Th site, Th is bonded in a 3-coordinate geometry to three equivalent C atoms. All Th–C bond lengths are 2.49 Å. There are two inequivalent C sites. In the first C site, C is bonded to six Th atoms to form a mixture of edge and corner-sharing CTh6 octahedra. The corner-sharing octahedral tilt angles are 4°. In the second C site, C is bonded to six equivalent Th atoms to form a mixture of edge and corner-sharing CTh6 octahedra. The corner-sharing octahedral tilt angles are 4°.